NH-3964 - Refactor reflection patterns

[fredericDelaporte]

NH-3964 - This is a sort of follow up to NH-3952: remove usage of EnumerableHelper.
They were replaced by ReflectionHelper, and additionally cached whenever possible and useful.
This improvement aims at similarly caching other MethodInfo/PropertyInfo reflected through older ReflectionHelper usages (impacts Linq namespace), or any other means (most other NHibernate namespaces).
If adequate, those other means of reflecting should be replaced by ReflectionHelper.

[fredericDelaporte]

Rebased for resolving a conflict on test project.

[fredericDelaporte]

By the way, I may refactor further if you wish: put the methods Hazzik was suggesting here in Util.ReflectHelper:

    public static MethodInfo GetMethod<T, TResult>(Func<T, TResult> func, T arg1)
    {
        return func.Method;
    }

Then obsolete Linq.ReflectionHelper (> 200 calls to move to ReflectHelper).

[hazzik]

@fredericDelaporte I was trying to hijack the PR and added refactoring to use func.Method, but it did no work well. I think for now the PR can be merged as is.

[hazzik]

@fredericDelaporte, if you are going to do more work in this field, please use the same JIRA number.

[fredericDelaporte]

Ok. I think Linq.ReflectionHelper should be consolidated into Util.ReflectHelper, and doing it with your methods would be better. I will probably come back later on that subject.